I think it looks very nice chibi. The cloud pic on the front seems a little low-res/blurry though. There are higher-res versions available on the web.
A good twist would also be to have the main title sidewards on the left side of cloud.
The back is quite neat and well organised. I think you should have that black area underneath the legal info stuff also the same yellow-ish color. I'm not too sure about having Aeris's head facing away from the viewer, maybe she should be facing towards us?
Maybe also experiment with different types of screen borders?
Also some of those hexagon effects on the front would look nice if you can subtlely blend them on the back cover.
